Although most of what you find online about this topic is about recirculating pumps, that's not the best way to get faster hot water. The key is in how much water needs to be pushed out of the pipes, and you can fix that by sizing your pipes correctly.

0:06 - Introduction
1:36 - My hot water retrofit
3:40 - My improved retrofit
6:54 - Summary
9:20 - Resources

The reason the amount of water that has to be pushed out of the pipe is more than the water in the pipe is mixing. See the article below called "Why Your Hot Water Takes So Long" for more details.

This video is part of the following article:

An Improved System for Even Faster Hot Water
https://www.energyvanguard.com/blog/a...

You can find more details about this type of retrofit, including parts needed, in these articles:

A Hot Water System Retrofit for an Old House
https://www.energyvanguard.com/blog/a...

How I Got Faster Hot Water
https://www.energyvanguard.com/blog/h...

More articles on this topic:

Faster Hot Water Can Change Your Life
https://www.energyvanguard.com/blog/f...

Why Your Hot Water Takes So Long
https://www.energyvanguard.com/blog/w...

Water Heating Is a System, Not Just a Water Heater
https://www.energyvanguard.com/blog/w...